A ALEKS-Dalton McCom wl Document 2.docx-Mic- xY? LiveGrades. Connecting . C Cheg

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A ALEKS-Dalton McCom wl Document 2.docx-Mic- xY? LiveGrades. Connecting . C Chegg Study l Guided S, × × Secure https://www-awh.aleks.com/alekscgi/x/Isl.exe/1o_u-lgNslkr7j8P3jH-lijk6J-TZh4JYC7viz6_juOtYisau7L4e3uhkLTwtxSTNcy5QqFfzNdTnHrJKntsF81fgBlkmytDkTABGvguyWp.. O ENTROPY AND FREE ENERGY Using reaction free energy to predict equilibrium composition Dalton Consider the following equilibrium: N204 (g)-2NO2 (g) G0 = 5.4 kJ Now suppose a reaction vessel is filled with 6.23 atm of dinitrogen tetroxide (N2O4) at 71. °C. Answer the following questions about this system alo O rise Under these conditions, will the pressure or N2 tend to rise or fall? O fall Ar Is it possible to reverse this tendency by adding NO2 In other words, ir you said the pressure or N2w end to rise, can that be changed to a tendency to fall by adding NO2? Similarly, if you said the pressure or N2 will tend to fall, can that be changed to a tendency to ise by adding NO2 Ir you said the tendency can be reversed in the second question, calculate the minimum pressure of NO2 needed to reverse it. Round your answer to 2 significant digits. yes Check 7:20

Explanation / Answer

pressure of N2O4 will fall.

Yes, it is possible to reverse it.

DG0 = - RTlnK

5.4 = -8.314*10^-3*(71+273.15)lnk

k = equilibrium constant = 0.15

k = pNO2^2/pN2O4

0.15 = (2X)^2/(6.23-X)

X = 0.465

pNO2 = 2x = 2*0.465 = 0.93 atm

minimum pressure of NO2 required to reverse the process = 0.93 atm

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